Viferral
吡啶与三氯甲醛聚合物
🗣️ 情景例句
Thank you.
谢谢 。
What's your nationality?
你是什么国籍？
To protect themselves from the icy water, they had to wear special rubber suits.
湖水冰冷刺骨，他们必须穿上一种特制的橡皮服以保护自己。